1 #!/usr/bin/env bash
2 # SPDX-License-Identifier: GPL-2.0
3 # Manipulate options in a .config file from the command line
4
5 myname=${0##*/}
6
7 # If no prefix forced, use the default CONFIG_
8 CONFIG_="${CONFIG_-CONFIG_}"
9
10 # We use an uncommon delimiter for sed substitutions
11 SED_DELIM=$(echo -en "\001")
12
13 usage() {
14 cat >&2 <<EOL
15 Manipulate options in a .config file from the command line.
16 Usage:
17 $myname options command ...
18 commands:
19 --enable|-e option Enable option
20 --disable|-d option Disable option
21 --module|-m option Turn option into a module
22 --set-str option string
23 Set option to "string"
24 --set-val option value
25 Set option to value
26 --undefine|-u option Undefine option
27 --state|-s option Print state of option (n,y,m,undef)
28
29 --enable-after|-E beforeopt option
30 Enable option directly after other option
31 --disable-after|-D beforeopt option
32 Disable option directly after other option
33 --module-after|-M beforeopt option
34 Turn option into module directly after other option
35
36 commands can be repeated multiple times
37
38 options:
39 --file config-file .config file to change (default .config)
40 --keep-case|-k Keep next symbols' case (dont' upper-case it)
41
42 $myname doesn't check the validity of the .config file. This is done at next
43 make time.
44
45 By default, $myname will upper-case the given symbol. Use --keep-case to keep
46 the case of all following symbols unchanged.
47
48 $myname uses 'CONFIG_' as the default symbol prefix. Set the environment
49 variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
50 EOL
51 exit 1
52 }
53
54 checkarg() {
55 ARG="$1"
56 if [ "$ARG" = "" ] ; then
57 usage
58 fi
59 case "$ARG" in
60 ${CONFIG_}*)
61 ARG="${ARG/${CONFIG_}/}"
62 ;;
63 esac
64 if [ "$MUNGE_CASE" = "yes" ] ; then
65 ARG="`echo $ARG | tr a-z A-Z`"
66 fi
67 }
68
69 txt_append() {
70 local anchor="$1"
71 local insert="$2"
72 local infile="$3"
73 local tmpfile="$infile.swp"
74
75 # sed append cmd: 'a\' + newline + text + newline
76 cmd="$(printf "a\\%b$insert" "\n")"
77
78 sed -e "/$anchor/$cmd" "$infile" >"$tmpfile"
79 # replace original file with the edited one
80 mv "$tmpfile" "$infile"
81 }
82
83 txt_subst() {
84 local before="$1"
85 local after="$2"
86 local infile="$3"
87 local tmpfile="$infile.swp"
88
89 sed -e "s$SED_DELIM$before$SED_DELIM$after$SED_DELIM" "$infile" >"$tmpfile"
90 # replace original file with the edited one
91 mv "$tmpfile" "$infile"
92 }
93
94 txt_delete() {
95 local text="$1"
96 local infile="$2"
97 local tmpfile="$infile.swp"
98
99 sed -e "/$text/d" "$infile" >"$tmpfile"
100 # replace original file with the edited one
101 mv "$tmpfile" "$infile"
102 }
103
104 set_var() {
105 local name=$1 new=$2 before=$3
106
107 name_re="^($name=|# $name is not set)"
108 before_re="^($before=|# $before is not set)"
109 if test -n "$before" && grep -Eq "$before_re" "$FN"; then
110 txt_append "^$before=" "$new" "$FN"
111 txt_append "^# $before is not set" "$new" "$FN"
112 elif grep -Eq "$name_re" "$FN"; then
113 txt_subst "^$name=.*" "$new" "$FN"
114 txt_subst "^# $name is not set" "$new" "$FN"
115 else
116 echo "$new" >>"$FN"
117 fi
118 }
119
120 undef_var() {
121 local name=$1
122
123 txt_delete "^$name=" "$FN"
124 txt_delete "^# $name is not set" "$FN"
125 }
126
127 if [ "$1" = "--file" ]; then
128 FN="$2"
129 if [ "$FN" = "" ] ; then
130 usage
131 fi
132 shift 2
133 else
134 FN=.config
135 fi
136
137 if [ "$1" = "" ] ; then
138 usage
139 fi
140
141 MUNGE_CASE=yes
142 while [ "$1" != "" ] ; do
143 CMD="$1"
144 shift
145 case "$CMD" in
146 --keep-case|-k)
147 MUNGE_CASE=no
148 continue
149 ;;
150 --refresh)
151 ;;
152 --*-after|-E|-D|-M)
153 checkarg "$1"
154 A=$ARG
155 checkarg "$2"
156 B=$ARG
157 shift 2
158 ;;
159 -*)
160 checkarg "$1"
161 shift
162 ;;
163 esac
164 case "$CMD" in
165 --enable|-e)
166 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
167 ;;
168
169 --disable|-d)
170 set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
171 ;;
172
173 --module|-m)
174 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
175 ;;
176
177 --set-str)
178 # sed swallows one level of escaping, so we need double-escaping
179 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
180 shift
181 ;;
182
183 --set-val)
184 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
185 shift
186 ;;
187 --undefine|-u)
188 undef_var "${CONFIG_}$ARG"
189 ;;
190
191 --state|-s)
192 if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
193 echo n
194 else
195 V="$(grep "^${CONFIG_}$ARG=" $FN)"
196 if [ $? != 0 ] ; then
197 echo undef
198 else
199 V="${V/#${CONFIG_}$ARG=/}"
200 V="${V/#\"/}"
201 V="${V/%\"/}"
202 V="${V//\\\"/\"}"
203 echo "${V}"
204 fi
205 fi
206 ;;
207
208 --enable-after|-E)
209 set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
210 ;;
211
212 --disable-after|-D)
213 set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
214 ;;
215
216 --module-after|-M)
217 set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
218 ;;
219
220 # undocumented because it ignores --file (fixme)
221 --refresh)
222 yes "" | make oldconfig
223 ;;
224
225 *)
226 echo "bad command: $CMD" >&2
227 usage
228 ;;
229 esac
230 done
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